For the purposes of pursuing conquest in Darkfall, this translates well to

Attack their people, their reputation, their forums, their bank;

Accuse them of zerging to anyone who will effectively care¹;

'World' PvP, raids, harvesting the harvesters, or any other PK'ing activity;

Sieges. Nasty expensive things that make you late for dinner or bed.

In fact, it's really not hard to tell, by how closely some have stuck to this formula for success, which folks have been reading their Sun Tzu and which have not.¹ Although there is no force superiour in numbers that an enemy will not characterise as a 'zerg'. ² Also, where any single player has a better prospective kill ratio than the group he is facing, there exists a Zerg of One.